old3eyes: Disagree and there's a few others do here as well especially if you're on a salary when you get paid on say the 15th of the month. 28 days makes no sense. If I got paid every 28 days then I would get 13 pay days a month rather than 12.
@old3eyes agree the 28 day plans are a rip and only designed so customers have to buy 13 packs per year instead of 12
2degrees is the only carrier that does calendar month across it's postpaid and Prepaid plans (I think)
Kogan mobile does full month plus warehouse mobile on prepay.